This looks like a long shot, but does anyone know of a way to:
Yo
I just wrote a category to change the tabbar's height
you can check this out UITabBar height in iOS 5
hope it will help you :)
you don't need private API, just try this in your applicationDidFinishLaunching method.
controller = [[UITabBarController alloc] initWithNibName:nil bundle:nil];
HeadlinesViewController *headlines = [[HeadlinesViewController alloc] init];
OpinionsViewController *opinions = [[OpinionsViewController alloc] init];
controller.viewControllers = [NSArray arrayWithObjects:headlines, opinions, nil];
// set your position , width and height there
controller.tabBar.frame = CGRectMake(0, 20, 320, 50);
[window addSubview:controller.view ];
[window makeKeyAndVisible];